package docfill

import (
	"database/sql"
	"errors"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestRunResolvesConfigRelativePathsAndSanitizesOutputFileNames(t *testing.T) {
	dir := t.TempDir()
	taskDir := filepath.Join(dir, "task")
	if err := os.MkdirAll(taskDir, 0o755); err != nil {
		t.Fatalf("make task dir: %v", err)
	}

	writeWorkbook(t, filepath.Join(taskDir, "data.xlsx"), "Daily", [][]string{
		{"name", "done"},
		{"张/三:测试", "已完成"},
	})
	writeWorkbook(t, filepath.Join(taskDir, "template.xlsx"), "日报", [][]string{
		{"{{name}}", "{{done}}"},
	})
	configPath := filepath.Join(taskDir, "task.json")
	writeJSON(t, configPath, map[string]any{
		"data": map[string]any{
			"type":  "excel",
			"path":  "./data.xlsx",
			"sheet": "Daily",
		},
		"template": map[string]any{
			"path": "./template.xlsx",
		},
		"output": map[string]any{
			"path": "./out/日报_{{name}}.xlsx",
		},
	})

	result, err := RunWithOptions(configPath, RunOptions{})
	if err != nil {
		t.Fatalf("RunWithOptions returned error: %v", err)
	}

	wantPath := filepath.Join(taskDir, "out", "日报_张_三_测试.xlsx")
	if len(result.Files) != 1 || result.Files[0] != wantPath {
		t.Fatalf("result files = %#v, want %q", result.Files, wantPath)
	}
	assertWorkbookCell(t, wantPath, "日报", "A1", "张/三:测试")
}

func TestRunUsesVarsForSQLiteParamsAndTemplateDefaults(t *testing.T) {
	dir := t.TempDir()
	dbPath := filepath.Join(dir, "daily.db")
	templatePath := filepath.Join(dir, "template.docx")
	configPath := filepath.Join(dir, "task.json")

	seedP0SQLite(t, dbPath, `
		create table daily (name text, date text, done text);
		insert into daily values
			('张三', '2026-06-18', '完成旧日报'),
			('李四', '2026-06-19', '完成新日报');
	`)
	writeMinimalDocx(t, templatePath, "批次：{{batch}}\n日期：{{date}}\n员工：{{name}}\n内容：{{done}}")
	writeJSON(t, configPath, map[string]any{
		"vars": map[string]any{
			"date":  "2026-06-18",
			"batch": "默认批次",
		},
		"data": map[string]any{
			"type":   "sqlite",
			"path":   dbPath,
			"query":  "select name, date, done from daily where date = ?",
			"params": []any{"{{date}}"},
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path": filepath.Join(dir, "out", "日报_{{batch}}_{{date}}_{{name}}.docx"),
		},
	})

	result, err := RunWithOptions(configPath, RunOptions{
		Vars: map[string]string{
			"date":  "2026-06-19",
			"batch": "命令行批次",
		},
	})
	if err != nil {
		t.Fatalf("RunWithOptions returned error: %v", err)
	}

	if len(result.Files) != 1 {
		t.Fatalf("expected 1 generated file, got %#v", result.Files)
	}
	got := readZipEntry(t, result.Files[0], "word/document.xml")
	if !strings.Contains(got, "批次：命令行批次") || !strings.Contains(got, "员工：李四") {
		t.Fatalf("unexpected rendered docx body: %q", got)
	}
	if strings.Contains(got, "张三") || strings.Contains(result.Files[0], "默认批次") {
		t.Fatalf("CLI vars did not override config vars: file=%q body=%q", result.Files[0], got)
	}
}

func TestRunSupportsExcelHeaderRow(t *testing.T) {
	dir := t.TempDir()
	dataPath := filepath.Join(dir, "data.xlsx")
	templatePath := filepath.Join(dir, "template.xlsx")
	configPath := filepath.Join(dir, "task.json")

	writeWorkbook(t, dataPath, "Daily", [][]string{
		{"日报导出数据"},
		{"name", "done"},
		{"张三", "完成日报"},
	})
	writeWorkbook(t, templatePath, "日报", [][]string{
		{"员工", "{{name}}"},
		{"完成", "{{done}}"},
	})
	writeJSON(t, configPath, map[string]any{
		"data": map[string]any{
			"type":       "excel",
			"path":       dataPath,
			"sheet":      "Daily",
			"header_row": 2,
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path": filepath.Join(dir, "out", "日报_{{name}}.xlsx"),
		},
	})

	if err := Run(configPath); err != nil {
		t.Fatalf("Run returned error: %v", err)
	}

	assertWorkbookCell(t, filepath.Join(dir, "out", "日报_张三.xlsx"), "日报", "B1", "张三")
}

func TestRunRefusesToOverwriteUnlessConfigured(t *testing.T) {
	dir := t.TempDir()
	dataPath := filepath.Join(dir, "data.xlsx")
	templatePath := filepath.Join(dir, "template.xlsx")
	configPath := filepath.Join(dir, "task.json")
	outputPath := filepath.Join(dir, "out", "日报_张三.xlsx")

	writeWorkbook(t, dataPath, "Daily", [][]string{
		{"name"},
		{"张三"},
	})
	writeWorkbook(t, templatePath, "日报", [][]string{{"{{name}}"}})
	if err := os.MkdirAll(filepath.Dir(outputPath), 0o755); err != nil {
		t.Fatalf("make output dir: %v", err)
	}
	if err := os.WriteFile(outputPath, []byte("existing"), 0o644); err != nil {
		t.Fatalf("write existing output: %v", err)
	}
	writeJSON(t, configPath, map[string]any{
		"data": map[string]any{
			"type":  "excel",
			"path":  dataPath,
			"sheet": "Daily",
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path": outputPath,
		},
	})

	err := Run(configPath)
	if err == nil || !strings.Contains(err.Error(), "already exists") {
		t.Fatalf("expected already exists error, got %v", err)
	}
	var appErr *AppError
	if !errors.As(err, &appErr) {
		t.Fatalf("expected AppError, got %T", err)
	}
	if appErr.Code != CodeOutputExists {
		t.Fatalf("error code = %s, want %s", appErr.Code, CodeOutputExists)
	}
	if appErr.Hint == "" || appErr.Context["output"] != outputPath {
		t.Fatalf("expected hint and output context, got %#v", appErr)
	}

	writeJSON(t, configPath, map[string]any{
		"data": map[string]any{
			"type":  "excel",
			"path":  dataPath,
			"sheet": "Daily",
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path":      outputPath,
			"overwrite": true,
		},
	})
	if err := Run(configPath); err != nil {
		t.Fatalf("Run with overwrite returned error: %v", err)
	}
	assertWorkbookCell(t, outputPath, "日报", "A1", "张三")
}

func TestRunFailsWhenTemplatePlaceholderIsMissing(t *testing.T) {
	dir := t.TempDir()
	dataPath := filepath.Join(dir, "data.xlsx")
	templatePath := filepath.Join(dir, "template.xlsx")
	configPath := filepath.Join(dir, "task.json")

	writeWorkbook(t, dataPath, "Daily", [][]string{
		{"name"},
		{"张三"},
	})
	writeWorkbook(t, templatePath, "日报", [][]string{{"{{name}}", "{{missing}}"}})
	writeJSON(t, configPath, map[string]any{
		"data": map[string]any{
			"type":  "excel",
			"path":  dataPath,
			"sheet": "Daily",
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path": filepath.Join(dir, "out", "日报_{{name}}.xlsx"),
		},
	})

	err := Run(configPath)
	if err == nil || !strings.Contains(err.Error(), "missing template field") {
		t.Fatalf("expected missing template field error, got %v", err)
	}
	var appErr *AppError
	if !errors.As(err, &appErr) {
		t.Fatalf("expected AppError, got %T", err)
	}
	if appErr.Code != CodeTemplateFieldMissing {
		t.Fatalf("error code = %s, want %s", appErr.Code, CodeTemplateFieldMissing)
	}
	if appErr.Context["field"] != "missing" || appErr.Context["template"] != templatePath {
		t.Fatalf("unexpected context: %#v", appErr.Context)
	}
	if !strings.Contains(appErr.Hint, "missing") {
		t.Fatalf("unexpected hint: %q", appErr.Hint)
	}
}

func TestRunFailsWhenRenderedTemplateStillHasPlaceholder(t *testing.T) {
	dir := t.TempDir()
	dataPath := filepath.Join(dir, "data.xlsx")
	templatePath := filepath.Join(dir, "template.xlsx")
	configPath := filepath.Join(dir, "task.json")

	writeWorkbook(t, dataPath, "Daily", [][]string{
		{"name", "done"},
		{"张三", "{{still_pending}}"},
	})
	writeWorkbook(t, templatePath, "日报", [][]string{{"{{name}}", "{{done}}"}})
	writeJSON(t, configPath, map[string]any{
		"data": map[string]any{
			"type":  "excel",
			"path":  dataPath,
			"sheet": "Daily",
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path": filepath.Join(dir, "out", "日报_{{name}}.xlsx"),
		},
	})

	err := Run(configPath)
	if err == nil || !strings.Contains(err.Error(), "unresolved placeholder") {
		t.Fatalf("expected unresolved placeholder error, got %v", err)
	}
}

func TestRunFiltersExcelRowsByMultipleEqualsAndVars(t *testing.T) {
	dir := t.TempDir()
	dataPath := filepath.Join(dir, "tickets.xlsx")
	templatePath := filepath.Join(dir, "ticket-template.xlsx")
	configPath := filepath.Join(dir, "task.json")

	writeWorkbook(t, dataPath, "工单", [][]string{
		{"日期", "工单编号", "客户名称", "处理结果"},
		{"2026-06-18", "GD-001", "A 公司", "已派单"},
		{"2026-06-18", "GD-002", "B 公司", "已完成"},
		{"2026-06-19", "GD-001", "C 公司", "待复核"},
	})
	writeWorkbook(t, templatePath, "工单", [][]string{
		{"编号", "{{工单编号}}"},
		{"客户", "{{客户名称}}"},
		{"结果", "{{处理结果}}"},
	})
	writeJSON(t, configPath, map[string]any{
		"vars": map[string]any{
			"date": "2026-06-17",
		},
		"data": map[string]any{
			"type":  "excel",
			"path":  dataPath,
			"sheet": "工单",
		},
		"filter": map[string]any{
			"equals": map[string]any{
				"日期":   "{{date}}",
				"工单编号": "{{ticket_no}}",
			},
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path": filepath.Join(dir, "out", "工单_{{日期}}_{{工单编号}}.xlsx"),
		},
	})

	result, err := RunWithOptions(configPath, RunOptions{
		Vars: map[string]string{
			"date":      "2026-06-18",
			"ticket_no": "GD-002",
		},
	})
	if err != nil {
		t.Fatalf("RunWithOptions returned error: %v", err)
	}

	wantPath := filepath.Join(dir, "out", "工单_2026-06-18_GD-002.xlsx")
	if len(result.Files) != 1 || result.Files[0] != wantPath {
		t.Fatalf("result files = %#v, want only %q", result.Files, wantPath)
	}
	assertWorkbookCell(t, wantPath, "工单", "B2", "B 公司")
	assertWorkbookCell(t, wantPath, "工单", "B3", "已完成")
}

func TestRunFilterAllowsManyRowsWhenConfigured(t *testing.T) {
	dir := t.TempDir()
	dbPath := filepath.Join(dir, "tickets.db")
	templatePath := filepath.Join(dir, "ticket-template.xlsx")
	configPath := filepath.Join(dir, "task.json")

	seedP0SQLite(t, dbPath, `
		create table tickets (
			report_date text,
			department text,
			ticket_no text,
			result text
		);
		insert into tickets values
			('2026-06-18', '营销部', 'GD-001', '已派单'),
			('2026-06-18', '客服部', 'GD-002', '已完成'),
			('2026-06-19', '营销部', 'GD-003', '待复核');
	`)
	writeWorkbook(t, templatePath, "工单", [][]string{
		{"编号", "{{ticket_no}}"},
		{"部门", "{{department}}"},
		{"结果", "{{result}}"},
	})
	writeJSON(t, configPath, map[string]any{
		"data": map[string]any{
			"type":  "sqlite",
			"path":  dbPath,
			"query": "select report_date, department, ticket_no, result from tickets order by ticket_no",
		},
		"filter": map[string]any{
			"equals": map[string]any{
				"report_date": "{{date}}",
			},
			"expect": "many",
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path": filepath.Join(dir, "out", "工单_{{ticket_no}}_{{_row}}.xlsx"),
		},
	})

	result, err := RunWithOptions(configPath, RunOptions{Vars: map[string]string{"date": "2026-06-18"}})
	if err != nil {
		t.Fatalf("RunWithOptions returned error: %v", err)
	}

	if len(result.Files) != 2 {
		t.Fatalf("expected 2 filtered files, got %#v", result.Files)
	}
	assertWorkbookCell(t, filepath.Join(dir, "out", "工单_GD-001_1.xlsx"), "工单", "B3", "已派单")
	assertWorkbookCell(t, filepath.Join(dir, "out", "工单_GD-002_2.xlsx"), "工单", "B2", "客服部")
}

func TestRunFilterFailsWhenNoRowsMatch(t *testing.T) {
	dir := t.TempDir()
	dataPath := filepath.Join(dir, "tickets.xlsx")
	templatePath := filepath.Join(dir, "template.xlsx")
	configPath := filepath.Join(dir, "task.json")

	writeWorkbook(t, dataPath, "工单", [][]string{
		{"日期", "工单编号", "处理结果"},
		{"2026-06-18", "GD-001", "已派单"},
	})
	writeWorkbook(t, templatePath, "工单", [][]string{{"{{工单编号}}", "{{处理结果}}"}})
	writeJSON(t, configPath, map[string]any{
		"data": map[string]any{
			"type":  "excel",
			"path":  dataPath,
			"sheet": "工单",
		},
		"filter": map[string]any{
			"equals": map[string]any{
				"日期":   "{{date}}",
				"工单编号": "{{ticket_no}}",
			},
			"expect": "one",
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path": filepath.Join(dir, "out", "工单_{{工单编号}}.xlsx"),
		},
	})

	err := RunWithOptionsError(configPath, RunOptions{Vars: map[string]string{
		"date":      "2026-06-18",
		"ticket_no": "GD-999",
	}})
	assertAppErrorCode(t, err, ErrorCode("DATA_FILTER_NO_MATCH"))
}

func TestRunFilterFailsWhenOneRowExpectedButManyMatch(t *testing.T) {
	dir := t.TempDir()
	dataPath := filepath.Join(dir, "tickets.xlsx")
	templatePath := filepath.Join(dir, "template.xlsx")
	configPath := filepath.Join(dir, "task.json")

	writeWorkbook(t, dataPath, "工单", [][]string{
		{"日期", "工单编号", "处理结果"},
		{"2026-06-18", "GD-001", "已派单"},
		{"2026-06-18", "GD-002", "已完成"},
	})
	writeWorkbook(t, templatePath, "工单", [][]string{{"{{工单编号}}", "{{处理结果}}"}})
	writeJSON(t, configPath, map[string]any{
		"data": map[string]any{
			"type":  "excel",
			"path":  dataPath,
			"sheet": "工单",
		},
		"filter": map[string]any{
			"equals": map[string]any{
				"日期": "{{date}}",
			},
			"expect": "one",
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path": filepath.Join(dir, "out", "工单_{{工单编号}}.xlsx"),
		},
	})

	err := RunWithOptionsError(configPath, RunOptions{Vars: map[string]string{"date": "2026-06-18"}})
	assertAppErrorCode(t, err, ErrorCode("DATA_FILTER_MULTI_MATCH"))
}

func TestRunFilterFailsWhenFieldIsMissing(t *testing.T) {
	dir := t.TempDir()
	dataPath := filepath.Join(dir, "tickets.xlsx")
	templatePath := filepath.Join(dir, "template.xlsx")
	configPath := filepath.Join(dir, "task.json")

	writeWorkbook(t, dataPath, "工单", [][]string{
		{"日期", "处理结果"},
		{"2026-06-18", "已派单"},
	})
	writeWorkbook(t, templatePath, "工单", [][]string{{"{{处理结果}}"}})
	writeJSON(t, configPath, map[string]any{
		"data": map[string]any{
			"type":  "excel",
			"path":  dataPath,
			"sheet": "工单",
		},
		"filter": map[string]any{
			"equals": map[string]any{
				"工单编号": "{{ticket_no}}",
			},
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path": filepath.Join(dir, "out", "工单.xlsx"),
		},
	})

	err := RunWithOptionsError(configPath, RunOptions{Vars: map[string]string{"ticket_no": "GD-001"}})
	assertAppErrorCode(t, err, ErrorCode("DATA_FILTER_FIELD"))
}

func TestRunFilterFailsWhenVariableIsMissing(t *testing.T) {
	dir := t.TempDir()
	dataPath := filepath.Join(dir, "tickets.xlsx")
	templatePath := filepath.Join(dir, "template.xlsx")
	configPath := filepath.Join(dir, "task.json")

	writeWorkbook(t, dataPath, "工单", [][]string{
		{"日期", "工单编号", "处理结果"},
		{"2026-06-18", "GD-001", "已派单"},
	})
	writeWorkbook(t, templatePath, "工单", [][]string{{"{{工单编号}}", "{{处理结果}}"}})
	writeJSON(t, configPath, map[string]any{
		"data": map[string]any{
			"type":  "excel",
			"path":  dataPath,
			"sheet": "工单",
		},
		"filter": map[string]any{
			"equals": map[string]any{
				"工单编号": "{{ticket_no}}",
			},
		},
		"template": map[string]any{
			"path": templatePath,
		},
		"output": map[string]any{
			"path": filepath.Join(dir, "out", "工单_{{工单编号}}.xlsx"),
		},
	})

	err := RunWithOptionsError(configPath, RunOptions{})
	assertAppErrorCode(t, err, ErrorCode("DATA_FILTER_VALUE"))
}

func RunWithOptionsError(configPath string, opts RunOptions) error {
	_, err := RunWithOptions(configPath, opts)
	return err
}

func assertAppErrorCode(t *testing.T, err error, want ErrorCode) {
	t.Helper()

	if err == nil {
		t.Fatalf("expected %s error, got nil", want)
	}
	var appErr *AppError
	if !errors.As(err, &appErr) {
		t.Fatalf("expected AppError, got %T: %v", err, err)
	}
	if appErr.Code != want {
		t.Fatalf("error code = %s, want %s; error=%v", appErr.Code, want, err)
	}
}

func seedP0SQLite(t *testing.T, path, statements string) {
	t.Helper()

	db, err := sql.Open("sqlite", path)
	if err != nil {
		t.Fatalf("open sqlite: %v", err)
	}
	defer db.Close()

	if _, err := db.Exec(statements); err != nil {
		t.Fatalf("seed sqlite: %v", err)
	}
}